Trapt

Unlockables
Once you find out that you unlocked the secrets in the game, you will be
prompted to save the game to able to acquire the secrets.
UnlockableHow to Unlock
Death Hammer Ceiling TrapComplete "Story Mode" and receive ending A. The
Death Hammer ceiling trap will be available to buy in "Trap Elements"
menu.
Death Iron Wall TrapComplete "Story Mode" and receive ending B. The Death
Iron wall trap will be available to buy in "Trap Elements" menu.
Death Pillar Floor TrapComplete "Story Mode" and receive ending C. The
Death Pillar floor trap will available to buy in "Trap Elements" menu.
Gallery Mode in MuseumPurchase all of the available traps in "Trap
Elements" menu to unlock "Gallery Mode" in the "Museum" menu.
Millenia Costume in OptionAcquire 300,000 total Arks. The costume/outfit of
Millenia from Kagero:Deception II can be bought in "Trap Elements" and can
be set in "Option" menu.
Reina Costume in OptionsAcquire 100,000 total Arks. The costume/outfit of Reina
from Deception III: Dark Delusion can be bought in "Trap Elements" and can
be set in "Option" menu.
Sound Test in MuseumComplete the Character Encyclopedia by killing all the
intruders in the game. The Sound Test will be unlocked in the "Museum"
menu.